CN101477781B - Organic light emitting display device and driving method thereof - Google Patents

Organic light emitting display device and driving method thereof Download PDF

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CN101477781B
CN101477781B CN2008101679368A CN200810167936A CN101477781B CN 101477781 B CN101477781 B CN 101477781B CN 2008101679368 A CN2008101679368 A CN 2008101679368A CN 200810167936 A CN200810167936 A CN 200810167936A CN 101477781 B CN101477781 B CN 101477781B
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organic light
display device
emitting display
power supply
signal
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CN101477781A (en
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李东雨
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Samsung Display Co Ltd
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Samsung Mobile Display Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G09G2300/0866—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes by means of changes in the pixel supply voltage
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/066—Waveforms comprising a gently increasing or decreasing portion, e.g. ramp
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G09G2330/022—Power management, e.g. power saving in absence of operation, e.g. no data being entered during a predetermined time
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/028—Generation of voltages supplied to electrode drivers in a matrix display other than LCD

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)
  • Electroluminescent Light Sources (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

The present invention discloses an organic illuminated display device and drive method, which can smoothly switch between screens of an organic light emitting display by switching an image of a pixel unit into a black image by sequentially reducing the voltage of a first power supply at least two times to display the black image as the screen of the pixel unit transitions to the black image.

Description

Organic light-emitting display device and driving method thereof
Priority request
The application requires early prior to being submitted to Korea S Department of Intellectual Property on January 3rd, 2008 and by formal ownership equity of dividing the application of " organic light emitting display and the driving method thereof " that be equipped with sequence number 10-2008-0000734, and by with reference to this application is herein incorporated.
Technical field
The present invention relates to organic light-emitting display device and driving method thereof, more specifically, relate to a kind of organic light-emitting display device, and the method that drives organic light-emitting display device, to take over seamlessly the screen of display.
Background technology
The panel display apparatus that can reduce weight and cumulative volume that latest developments are got up is tending towards being used some shortcomings of the display device of cathode-ray tube (CRT).This recent panel display apparatus comprises LCD (LCD), Field Emission Display (FED), plasma display (PDP) and organic light emitting display (OLED) and other type.
Organic light-emitting display device utilizes organic light-emitting diode matrix display of visually image, and each Organic Light Emitting Diode all can be by the compound generation light in electronics and hole.Organic Light Emitting Diode has the advantage that can drive with low power consumption, and has response speed fast.
On the experience, the pixel cell that organic light-emitting display device is formed by a plurality of pixels, the driving circuit of drive signal is provided and constitutes to the power supply of pixel cell power supply to pixel cell.
The pixel emission has the light of the brightness corresponding with the data-signal that is applied to display device, and this data-signal is applied to display device synchronously with sweep signal.The emission brightness of pixel is subjected to the influence of pixel supply voltage in the organic light-emitting display device.That is to say the emission brightness of the electric power decision pixel that data-signal and power supply provided.Organic light-emitting display device is by arranging a plurality of pixels with the display of visually image with matrix-type.Organic light-emitting display device is to controlling via the magnitude of current that corresponding Organic Light Emitting Diode flows to second source from first power supply, and the image that is shown by those pixels has predetermined gray scale.
In order to prevent that panel from continuing to show single constant image in the long time section, do not reaching under the situation of the schedule time from users'data signals input, this organic light-emitting display device is switched to park mode (for example, display device continues to show the display device operator scheme of black on whole screen).But, in the organic light-emitting display device of prior art, when display device when for example display device presents single constant visual image and is switched to park mode for spectators' pattern, because brightness must be by flip-flop, therefore noise makes video image by noise shaping and be displayed on the screen of display device, has replaced the complete blank screen with park mode feature.In an identical manner, the organic light-emitting display device in the prior art practice is because power supply is turned off has problems when making brightness by flip-flop.
Summary of the invention
Therefore, the object of the present invention is to provide the method for a kind of improved organic light-emitting display device and a kind of improved driving organic light-emitting display device.
Another purpose is to provide a kind of organic light-emitting display device and a kind of method that drives organic light-emitting display device, and this method can realize taking over seamlessly between the screen of display device.
In order to realize these and other objects, one embodiment of the invention comprise a kind of method that is used to drive organic light-emitting display device, and it may further comprise the steps: will be by the step of the formed image switching of the pixel cell that comprises a plurality of pixels to picture black; And reduce amplitude at least twice successively, thereby after display device is switched to park mode, can continue to show the step of blank screen (that is picture black) completely from first power source voltage.
Exemplarily, the described step that switches to picture black comprises: because input signal may be not applied to display device and reach predetermined amount of time, therefore switch to the step of the application of park mode and shutoff electric power.
A kind of organic light-emitting display device that is constructed to the embodiment of the invention is provided, comprise the pixel cell of the cross section that is arranged in sweep trace and data line, and comprise and be used to control the pixel that flows to the magnitude of current of second source from first power supply via Organic Light Emitting Diode; When being switched to picture black, the image on being presented at described pixel cell generates the time schedule controller of screen switching signal; When being transfused to, described screen switching signal generates the voltage controller of a plurality of level signals successively; And when being transfused to, described level signal reducing by the first power supply generation unit of described first power source voltage successively.
Exemplarily, be not carried out when reaching the schedule time in the input from the outside, described time schedule controller is park mode and turn-offs electric power and use and generate described screen switching signal.The described first power supply generation unit reduces described first power source voltage, is displayed on the described pixel cell up to picture black.
Description of drawings
By with reference to the detailed description of considering below in conjunction with accompanying drawing, to become better understood more complete cognition of the present invention and the many attendant advantages of the present invention, and more apparent, in the accompanying drawings, identical Reference numeral refers to same or analogous parts, wherein:
Fig. 1 shows the schematic block diagram of the organic light emitting display that is constructed to the embodiment of the invention;
Fig. 2 shows in the practice of the principle of the invention process flow diagram of the operating process that can be realized by the voltage controller among Fig. 1 and the first power supply generation unit; And
Fig. 3 be illustrate along its ordinate unit corresponding with the voltage that is applied to the pixel two ends, be the screen intensity measured of unit and be two coordinate cartesian curves of the unit magnitude of current that flows through Organic Light Emitting Diode with the milliampere with every square metre of candela.
Embodiment
Describe according to certain exemplary embodiments of the present invention hereinafter with reference to accompanying drawing.Herein, when first element was described to be connected to second element, first element not only can be connected directly to second element, but also can be connected to second element indirectly via three element.Further, for clarity sake, omitted some, thereby avoided making principle of the present invention fuzzy the optional element of complete understanding the present invention.In addition, identical Reference numeral is represented components identical all the time.
Hereinafter, referring to figs. 1 through Fig. 3 the exemplary embodiment of the present invention that those skilled in the art in the invention can realize is easily described with concentrating.
Fig. 1 shows the schematic block diagram of the organic light emitting display that is constructed to the embodiment of the invention.
With reference to Fig. 1, the organic light emitting display that is constructed to the embodiment of the invention comprises pixel cell 30, scanner driver 10, data driver 20, time schedule controller 50, the first power supply generation unit 60 and voltage controller 70.
Pixel cell 30 comprises and is connected to a plurality of pixels 40 of sweep trace S1 to Sn and data line D1 to Dm.First voltage that pixel cell 30 will be provided from the first power supply ELVDD that the first power supply generation unit 60 provides and be applied to pixel 40 from second voltage that the second source ELVSS of external source provides.When selected sweep signal is applied in, the pixel 40 that has been provided the first power supply ELVDD and second source ELVSS applies the electric potential difference between ELVDD and the ELVSS at the two ends of Organic Light Emitting Diode 80, Organic Light Emitting Diode 80 emissions have the light of the brightness corresponding with the data-signal DATA that is applied then.
For this reason, pixel 40 includes the OLED (not shown) and the image element circuit of electric current is provided to Organic Light Emitting Diode 80.This image element circuit comprises at least two transistors and capacitor.This image element circuit is corresponding to described data-signal, to controlling via the magnitude of current that Organic Light Emitting Diode is provided for second source ELVSS from the first power supply ELVDD.Organic Light Emitting Diode is corresponding to the magnitude of current that is applied to image element circuit, red-emitting, green glow or blue light.
Simultaneously, although for the ease of explaination, Fig. 1 shows the design with the pixel 40 that is connected to a sweep trace and a data line, but the practice of the principle of the invention is not limited thereto.As an example, the structure that is included in the image element circuit in the pixel 40 can utilize current known various designs to set up, and in this case, according to the details of the structure of image element circuit, two or more multi-scan-line and two or more multiple photocontrol line (not shown) also can be connected to pixel 40.
Scanner driver 10 comes driven sweep line S1 to Sn by successively sweep signal being offered sweep trace S1 to Sn.When sweep signal was applied to sweep trace S1 successively to Sn, corresponding pixel 40 was selected successively by line unit.
Data driver 20 driving data lines D1 are to Dm.More specifically, data driver 20 utilizes the data that provide from time schedule controller 50 to generate data-signal, and when sweep signal was provided, the data-signal that institute is generated and applies offered data line D1 to Dm.Then, data-signal is applied to by selected those pixels 40 of sweep signal.
Time schedule controller 50 generates data drive control device signal DCS and turntable driving control signal SCS corresponding to the synchronizing signal SYNC that provides from external source.The data drive control signal DCS that time schedule controller 50 generates is provided for data driver 20, and the turntable driving control signal SCS that time schedule controller 50 generates is provided for scanner driver 10.By this way, time schedule controller 50 is corresponding to the synchronizing signal SYNC that provides from external source, gated sweep driver 10 and data driver 20.And 50 couples of data-signal DATA that provide from external source of time schedule controller are provided with again, offer data driver 20 with the data-signal RDATA that will be provided with again.
But, in practice of the present invention, when pixel cell 30 was switched with the demonstration blank screen, time schedule controller 50 offered voltage controller 70 with screen switching signal SSW.For example, display device is being set to park mode and is turn-offing under the such situation of the electric power of this display device, time schedule controller 50 offers voltage controller 70 with screen switching signal SSW.
Voltage controller 70 is corresponding to the screen switching signal SSW that is provided by time schedule controller 50, and the first power supply ELVDD that the first power supply generation unit 60 is generated is applied to the voltage level (that is amplitude) of pixel cell 30 and controls.When providing screen switching signal SSW from time schedule controller 50, voltage controller 70 offers a plurality of level signal LS the first power supply generation unit 60 successively.Herein, when data driver 20 was constructed to integrated circuit, voltage controller 70 can be contained in the data driver 20.The first power supply generation unit 60 generates the electric power that is applied to the first power supply ELVDD corresponding to the level signal LS that receives from voltage controller 70.More particularly, the first power supply generation unit 60 generates the voltage that is applied to pixel 40 by the first power supply ELVDD, this first power supply has by the first power supply generation unit 60 default voltage of level signal LS when voltage controller 70 receives, and the first power supply generation unit 60 provides the voltage that is applied to pixel 40 by the first power supply ELVDD.And when level signal was imported by voltage controller 70, the first power supply generation unit 60 reduced to be applied to by the first power supply ELVDD amplitude of the voltage of pixel 40 successively.For example, as example, successively when voltage controller 70 is transfused to three times, in response, the first power supply generation unit 60 is incrementally by reducing to be applied to by the first power supply ELVDD voltage of pixel 40 for three times successively at level signal LS.
Fig. 2 shows the process flow diagram of the operating process that can be realized by the voltage controller among Fig. 1 70 and the first power supply generation unit 60.
With reference to Fig. 2, at first when the image that will be shown by pixel cell 30 is switched to picture black, for example when display device being set to park mode and turn-offing the electric power of this display device, at step S100, time schedule controller 50 offers voltage controller 70 with screen switching signal SSW.
During step S102, voltage controller 70 generates level signal LS and these level signals LS is offered first power supply generation power supply 60 in response to the screen switching signal SSW that receives among the step S100.
When the first power supply generation unit 60 was provided to level signal LS in step S102, in step S104, the voltage of 60 couples first power supply ELVDD of the first power supply generation unit reduced predetermined voltage, offers pixel 40 with the voltage that will have the amplitude that reduces.
After this, when display device was in the process that is switched to park mode, if the user imports prearranged signals, for example if detect any signal of user's positive input of display device, in step S106, time schedule controller 50 stopped to provide the screen switching signal.In this case, the generation of the level signal LS that is undertaken by voltage controller 70 is interrupted, and in response to this interruption, in step S108, the first power supply generation unit 60 recovers to use the first power supply ELVDD with normal amplitude voltage, to offer pixel 40.
But, as an alternative, when not detecting the input from the user during step S106, in step S110, whether 70 pairs of voltage controllers should provide other level signal LS to judge to the first power supply generation unit 60.
If as the result who judges among the step S110, in step S102, other level signal is provided, and repeating step S102 is to S110 simultaneously.If result as the judgement of in step S110, carrying out, other level signal is not provided, that is to say that if the voltage of the first power supply ELVDD fully has been reduced to the amplitude of the voltage that is used to show picture black, then blank screen is displayed on (S112) on the pixel cell 30.
Simultaneously, voltage controller 70 offers the first power supply generation unit 60 at least twice or more times with level signal LS, thereby the voltage of the first power supply ELVDD can not reduced suddenly.As a result, the voltage of the first power supply ELVDD by increment ground reduce at least twice or more times.
Fig. 3 be on its ordinate, show as the brightness of the display device of the function of the amplitude of the voltage ELVDD that is applied to pixel 40 by first power supply and in Organic Light Emitting Diode two coordinate cartesian curves of electric current amount of flow.Table 1 is to obtain from the curve of Fig. 3.
ELVDD IEL(mA) L(Cd/m2)
4.6 40 184
4.5 34 150
4.4 28 121
4.3 23 95
4.2 18 74
4.1 14 56
4.0 11 41
3.9 8 29
3.8 6 20
3.7 4 13
3.6 3 9
3.5 2 5
3.4 1 3
3.3 - 1.5
3.2 - 0.75
3.1 - 0.37
3.0 - -
Table 1
Table 1 and Fig. 3 show in Organic Light Emitting Diode the electric current that flows with experimental technique and the brightness when the first power supply ELVDD is gradually reduced in 2.1 inches panels of display device.
With reference to table 1 and Fig. 3, voltage controller 70 offers level signal LS the first power supply generation unit 60 incrementally and reaches 17 times more than.In this case, when level signal LS was received, the amplitude of the voltage of 60 couples first power supply ELVDD of the first power supply generation unit reduced 0.1 volt increment.Simultaneously, level signal LS can be set to same signal or unlike signal when they are provided.For example, level signal LS can be set to 17 different signals, perhaps as an alternative, is set to data that have 17 different bits etc.
If the voltage of the first power supply ELVDD reduces by 0.1 volt, then the electric current I EL that flows in Organic Light Emitting Diode is reduced.If the electric current I EL that flows in Organic Light Emitting Diode is reduced, then the brightness L of respective pixel 40 is also reduced gradually.
In other words, when pixel cell 30 showed black, the present invention reduced the voltage at least twice of the first power supply ELVDD or more times incrementally gradually, thereby took over seamlessly the brightness of the screen of display device.
An embodiment as the principle of the invention, above-mentioned paragraph has been described a kind of circuit and method, when its screen at described pixel cell is converted to described picture black, by reducing first power source voltage at least twice successively to show described picture black, with the image switching of the pixel cell that will comprise picture element matrix to picture black, thereby can realize taking over seamlessly between the screen of organic light emitting display.Utilize this implementation, Organic Light Emitting Diode and driving method thereof according to principle of the invention practice, when picture black is displayed on the pixel cell, corresponding to the level signal LS in the time interval, the ELVDD and the electric potential difference between the ELVSS that are applied to the Organic Light Emitting Diode two ends of pixel cell are reduced to second value of voltage degressively from first value of voltage, thereby realize taking over seamlessly by the shown picture black of the screen of display device.
Though described the present invention in conjunction with certain exemplary embodiments, but, it should be understood that the present invention is not limited to the disclosed embodiments, on the contrary, the invention is intended to contain various modifications within the spirit and scope that are included in appended claims and equivalent thereof and be equal to setting.

Claims (10)

1. the driving method of an organic light-emitting display device, this organic light emitting display comprise that control flows to a plurality of pixels of the magnitude of current of second source from first power supply via Organic Light Emitting Diode, and this method may further comprise the steps:
Picture black is arrived in the image switching that will comprise the pixel cell of described a plurality of pixels; And
When being switched to described picture black, reduce described first power source voltage at least twice successively to show described picture black.
2. the driving method of organic light-emitting display device as claimed in claim 1, the wherein said step that switches to picture black comprises: do not reach the schedule time because input is carried out, therefore switch to park mode and power cutoff.
3. organic light-emitting display device comprises:
Pixel cell is arranged in the cross section of sweep trace and data line, and comprises that control flows to a plurality of pixels of the magnitude of current of second source via Organic Light Emitting Diode from first power supply;
Time schedule controller when being used for image on being presented at described pixel cell and being switched to picture black, generates the screen switching signal;
Voltage controller is used for generating a plurality of level signals successively when described screen switching signal is transfused to; And
The first power supply generation unit is used for reducing described first power source voltage successively when described level signal is transfused to.
4. organic light-emitting display device as claimed in claim 3 does not wherein reach the schedule time when the input from the outside is carried out, and under the situation of park mode and power cutoff, described time schedule controller generates described screen switching signal.
5. organic light-emitting display device as claimed in claim 3, the wherein said first power supply generation unit reduces described first power source voltage, is displayed on the described pixel cell until picture black.
6. organic light-emitting display device as claimed in claim 3 further comprises the scanner driver that is used for sweep signal is offered described sweep trace, and the data driver that is used for data-signal is offered described data line.
7. method that drives organic light-emitting display device may further comprise the steps:
In comprising the organic light-emitting display device of pel array, control flows to the magnitude of current of second source via Organic Light Emitting Diode from first power supply; And
By reducing the voltage at least twice at the described first power supply place successively, switching comprises that the pixel cell of described pel array is to present picture black.
8. method as claimed in claim 7, wherein, whether the signal of presentation video in the section at the fixed time be received judged, and when the signal that described judgement draws presentation video in described predetermined amount of time is not received, carries out and switch described pixel cell to present the step of described picture black.
9. method as claimed in claim 7 wherein, is switched described pixel cell to present the step of described picture black by carrying out, and described organic light-emitting display device is set to park mode.
10. method as claimed in claim 7 wherein, is switched described pixel cell to present the step of described picture black by carrying out, and responds the interruption of the electric power of described organic light-emitting display device.
CN2008101679368A 2008-01-03 2008-10-16 Organic light emitting display device and driving method thereof Active CN101477781B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020080000734 2008-01-03
KR10-2008-0000734 2008-01-03
KR1020080000734A KR100889679B1 (en) 2008-01-03 2008-01-03 Organic light emitting display and driving method thereof

Publications (2)

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KR100889679B1 (en) 2009-03-19
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